[Zope] Trying zope on Linux

I'm trying zope on linux but I have come a cross a problem. I windows, I simply changed the port number from 8080 to 80 in zope.conf so I could get to my site without typeing the port. But in Linux, I did the same thing but it always tells me that some other server already occupied this port. (and I just started too, so there shouldn't be any server. right??) I'm now trying to figure out what server to close but with no luck at all.. can someone help me so I can display my site on port 80? --------------------------------- Yahoo! Shopping Find Great Deals on Holiday Gifts at Yahoo! Shopping